Have been paying for 2mb line for years, now 1mb?

I have been paying for 199p/m for a 2mb uncapped line for years now. At the beginning of this month the speed of my internet dropped drastically. I decided to log into the customer web page, and see that I am now on a 1mb premium uncapped line. After phoning up, and waiting almost half an hour for response from both technical and billing support. I was told that I've been subscribed to 1mb the entire time, even though on multiple occasions I've run speed tests and seen my speed at 2mb. I also believe that I would know whether or not I was on a 2mb paln when I entered the contract. I've been told that I can migrate freely to a 2mb uncapped plan with throttling that starts after 70 gb, where previously this was never a stipulation. Mweb service has been dreadful throughout the years, yet I've stuck to them. I feel it's time to migrate to another ISP who doesn't waste my time.